266 PROCEEDINGS OF THE AMERICAN ACADEMY 



nate ; the thalline border somewhat entire, or at length more or less 

 crenulate. Paraphyses rather stout, branchmg, especially towai'ds the 

 thickened yellowish summits. Spore-sacks short, oblong, never appear- 

 ing to contain more than a single spore, which varies from roundish to 

 ovoid, and at length obtuse-ellipsoid ; the contents very often irregu- 

 larly disposed, but passing at length into two approximated sporoblasts, 

 scarcely showing any trace of an isthmus. Spermogones indicated by 

 their darker-colored ostioles ; spermatia very minute, short, appeai'ing 

 to be ellipsoid, or a little oblong. 



Placodium ph^um, sp. nov. : thallo subcartilagineo Igevigato mox 

 interrupto subareolato viridi-glaucescente hypothallo nigro prominente ; 

 apotheciis sessilibus biatorinis plano-convexulis disco fusco margine 

 integerrimo sub-concolore. Sp. parvula3, incolores ovoideo-ellipsoideae, 

 polari-diblasta3, diam. l|--22-° longiores. Lecanora, Tuckerm. in 

 Wright Lich. Cub. n. 112. On calcareous rocks in the island of Cuba, 

 Mr. Wright. The colors well distinguish this lichen, which is scarcely 

 comparable with any other of the group known to me. 



Lecanora (Squamaria) Bolanderi, sp. nov. : thallo ca;spitoso 

 dichotomo-ramosissimo viridi-stramineo, ramis teretibus fastigiatis, ex- 

 tremis papilteformibus obtusis ; apotheciis mediocribus terminalibus 

 sessilibus disco e carneo-luteolo fulvescente nudo, margine thallino tu- 

 mido integro. Sp. octonfe in thecis clavatis, incolores, mediocres, ovoideo- 

 ellipsoideae, simplices, limbataj, sporobl. dein variabili, diam. 1^-2|° 

 longiores. Spermatia acicularia, arcuata, sterigmatibus simplicibus in- 

 fixa. On rocks (" metamorphic sandstone ") in Marin county, Cali- 

 fornia, Mr. H. N. Bolander. Comparable, as respects the colors and 

 size, with L. rubina, but differing remarkably in its fruticulose thallus, 

 which is divided much as that of L. fruticulosa, Eversm., from the 

 Kirguis steppes. Sods irregularly rounded, and not much exceeding 

 an inch in diameter ; a central trunk dichotomously dividing into thick- 

 ish, short branches, (cartilagineous and greenish straw-colored with- 

 out, and with a densely compacted, white medullary layer,) which pass 

 at the summits into obtuse papillce. Apothecia not unlike those of L. 

 rubina, except in the persistently thicker margin, and the lighter-colored 

 disk. The present and two following species are associable with Squa- 

 maria, Nyl. {Placodium (Massal.) Th. Fr.), — a group undistinguishable, 

 however, from Lecanora (as compare Nyl. Lich. And. Boliv. in Ann. 

 Sci. 4. 15, p. 377, note) except by the more or less effigurate thallus. 



